Changes to code do not take efffect imediately (5 posts)

I change code in Presentation/Presentation theme and I clear my cache and cookies, yet the change does not tale place. I re-boot my machine and it still does not take effect. I go to a different PC and I DO see the changes. Usually I see my changes several hours later on the PC where I made the changes.

I have Comcast. When I asked about Caching, the rep had no idea and told me to search the Comcast Forums. However, it seems if I update the file from my web hosting panel the changes are immediate. If I change from the WP admin panel it takes a 1/2 hour for the change (probably due to Comcast's caching schedule). Anyone know why the difference.